Abstract
Reentrant behavior seems to be characteristic of systems with competing interactions even when no spin-glass phase exists. Using various methods (finite cluster approximation,1 mean-field renormalization,2 finite cluster renormalization, etc.) we determined the phase diagram of a two-dimensional square Ising model with random nearest-neighbor interactions Jij distributed according to P(Jij)=(1−p)δ(Jij−J)+pδ (Jij−αJ), where J>0 and 0>α>−1. Such a model has been considered by Wolff and Zittartz.3 These authors discussed its qualitative features and argued that a reentrant behavior should be observed. Our calculations agree with this conjecture.
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